Your answer depends on where you go on the continent, or which sub-Antarctic islands you visit.
Generally, you'd see local breeding animals, sea-going mammals and sea birds, and breath-taking geography with snow, ice and glaciers.
The Arctic or the Antarctic
You would be in the Arctic Region. Antarctic is the south polar region.
Reindeer are only found in the far north near the Arctic Circle.
The best places to see an aurora are near the poles of the earth: that would be way north near the arctic circle or way south near the antarctic circle.
Santa Lives at the north pole, so Reindeer must live up there....
You would possibly have the most amazing experience of your life.
North of the Antarctic circle is basically what you see on the bottom of flat maps. The waters are called the South Pacific, the South Indian and the South Atlantic oceans.
That would have to be parts of the Antarctic continent.
In the southern polar region.
Arctic.
Santa
Anything labeled 'sub-Antarctica' implies that the land lies near the Antarctic continent. A sub-Antarctic coast would be land -- possibly an island -- near Antarctica.